Long-term stabilization of the phase control technique of the stimulated Brillouin scattering wave for the beam combination technique

AbstractThe beam combination method using stimulated Brillouin scattering phase conjugate mirrors (SBS-PCMs) is a promising technique for a high energy and high power laser output operating with a high repetition rate. The two-beam combined system was previously demonstrated with an amplitude dividing method. A four-beam combined laser system with amplitude dividing method is demonstrated in this work, and the phase stabilization experiment of this system is performed using the self phase control and the long-term stabilization technique. The phase differences between the SBS waves are stabilized with λ/30 and the fluctuation of the four-beam combined output energy is 6.16% during 2000 shots (200 s).

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Beam combination characteristics in an array laser using stimulated Brillouin scattering phase conjugate mirrors considering partial coherency between the beams

Fusion Engineering and Design ◽

10.1016/s0920-3796(98)00307-x ◽

1999 ◽

Vol 44 (1-4) ◽

pp. 407-417 ◽

Cited By ~ 8

Author(s):

Hong Jin Kong ◽

Yun Sup Shin ◽

Hyogun Kim

Keyword(s):

Brillouin Scattering ◽

Stimulated Brillouin Scattering ◽

Phase Conjugate ◽

Beam Combination ◽

Scattering Phase ◽

Stimulated Brillouin

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Laser fusion driver using stimulated Brillouin scattering phase conjugate mirrors by a self-density modulation

Laser and Particle Beams ◽

10.1017/s0263034607000055 ◽

2007 ◽

Vol 25 (2) ◽

pp. 225-238 ◽

Cited By ~ 29

Author(s):

H.J. Kong ◽

J.W. Yoon ◽

D.H. Beak ◽

J.S. Shin ◽

S.K. Lee ◽

...

Keyword(s):

Brillouin Scattering ◽

Stimulated Brillouin Scattering ◽

Laser Fusion ◽

Phase Conjugate ◽

Beam Combination ◽

Density Modulation ◽

Scattering Phase ◽

The Cross ◽

Stimulated Brillouin ◽

Cross Type

A new concept of laser fusion driver is proposed, which uses a beam combination technique with stimulated Brillouin scattering phase conjugate mirror (SBS-PCM). It is constructed systematically with a cross-type amplifier as a basic unit. In the first part of this paper, we introduce the cross-type laser amplifier using SBS-PCM, with several advantages by experimental results. These advantages are the ideal properties for practical laser fusion driver, such as the perfect isolation of leak beam, the compensation of thermally induced birefringence through the amplifiers, the easy maintenance and alignment insensitiveness, and the freely-scale-up energy. Next, some successful results for the phase control of SBS-PCM are presented, which is one of the main problems in the current beam combination laser using SBS-PCM. Particularly, a new technique for controlling the phase of SBS-PCM, “self-density modulation,” is introduced, which is the simplest ever among those reported. With the advantages of the cross-type amplifier using SBS-PCM and the novel method for controlling the phase of SBS-PCM, the proposed beam combination laser system is presented as the most promising one, which can contribute to the realization of high energy laser that can operate with high repetition rate over 10 Hz, even in the case of huge output energy over MJ.

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